ecparam.c revision 1.1.1.8
1/* 2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10/* ==================================================================== 11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 12 * 13 * Portions of the attached software ("Contribution") are developed by 14 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 15 * 16 * The Contribution is licensed pursuant to the OpenSSL open source 17 * license provided above. 18 * 19 * The elliptic curve binary polynomial software is originally written by 20 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. 21 * 22 */ 23 24#include <openssl/opensslconf.h> 25#ifdef OPENSSL_NO_EC 26NON_EMPTY_TRANSLATION_UNIT 27#else 28 29# include <stdio.h> 30# include <stdlib.h> 31# include <time.h> 32# include <string.h> 33# include "apps.h" 34# include <openssl/bio.h> 35# include <openssl/err.h> 36# include <openssl/bn.h> 37# include <openssl/ec.h> 38# include <openssl/x509.h> 39# include <openssl/pem.h> 40 41typedef enum OPTION_choice { 42 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, 43 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C, 44 OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME, 45 OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_RAND, OPT_ENGINE 46} OPTION_CHOICE; 47 48OPTIONS ecparam_options[] = { 49 {"help", OPT_HELP, '-', "Display this summary"}, 50 {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"}, 51 {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"}, 52 {"in", OPT_IN, '<', "Input file - default stdin"}, 53 {"out", OPT_OUT, '>', "Output file - default stdout"}, 54 {"text", OPT_TEXT, '-', "Print the ec parameters in text form"}, 55 {"C", OPT_C, '-', "Print a 'C' function creating the parameters"}, 56 {"check", OPT_CHECK, '-', "Validate the ec parameters"}, 57 {"list_curves", OPT_LIST_CURVES, '-', 58 "Prints a list of all curve 'short names'"}, 59 {"no_seed", OPT_NO_SEED, '-', 60 "If 'explicit' parameters are chosen do not use the seed"}, 61 {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"}, 62 {"name", OPT_NAME, 's', 63 "Use the ec parameters with specified 'short name'"}, 64 {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "}, 65 {"param_enc", OPT_PARAM_ENC, 's', 66 "Specifies the way the ec parameters are encoded"}, 67 {"genkey", OPT_GENKEY, '-', "Generate ec key"}, 68 {"rand", OPT_RAND, 's', "Files to use for random number input"}, 69# ifndef OPENSSL_NO_ENGINE 70 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"}, 71# endif 72 {NULL} 73}; 74 75static OPT_PAIR forms[] = { 76 {"compressed", POINT_CONVERSION_COMPRESSED}, 77 {"uncompressed", POINT_CONVERSION_UNCOMPRESSED}, 78 {"hybrid", POINT_CONVERSION_HYBRID}, 79 {NULL} 80}; 81 82static OPT_PAIR encodings[] = { 83 {"named_curve", OPENSSL_EC_NAMED_CURVE}, 84 {"explicit", 0}, 85 {NULL} 86}; 87 88int ecparam_main(int argc, char **argv) 89{ 90 ENGINE *e = NULL; 91 BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL; 92 BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL; 93 BIO *in = NULL, *out = NULL; 94 EC_GROUP *group = NULL; 95 point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED; 96 char *curve_name = NULL, *inrand = NULL; 97 char *infile = NULL, *outfile = NULL, *prog; 98 unsigned char *buffer = NULL; 99 OPTION_CHOICE o; 100 int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0; 101 int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0; 102 int ret = 1, private = 0; 103 int list_curves = 0, no_seed = 0, check = 0, new_form = 0; 104 int text = 0, i, need_rand = 0, genkey = 0; 105 106 prog = opt_init(argc, argv, ecparam_options); 107 while ((o = opt_next()) != OPT_EOF) { 108 switch (o) { 109 case OPT_EOF: 110 case OPT_ERR: 111 opthelp: 112 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); 113 goto end; 114 case OPT_HELP: 115 opt_help(ecparam_options); 116 ret = 0; 117 goto end; 118 case OPT_INFORM: 119 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) 120 goto opthelp; 121 break; 122 case OPT_IN: 123 infile = opt_arg(); 124 break; 125 case OPT_OUTFORM: 126 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat)) 127 goto opthelp; 128 break; 129 case OPT_OUT: 130 outfile = opt_arg(); 131 break; 132 case OPT_TEXT: 133 text = 1; 134 break; 135 case OPT_C: 136 C = 1; 137 break; 138 case OPT_CHECK: 139 check = 1; 140 break; 141 case OPT_LIST_CURVES: 142 list_curves = 1; 143 break; 144 case OPT_NO_SEED: 145 no_seed = 1; 146 break; 147 case OPT_NOOUT: 148 noout = 1; 149 break; 150 case OPT_NAME: 151 curve_name = opt_arg(); 152 break; 153 case OPT_CONV_FORM: 154 if (!opt_pair(opt_arg(), forms, &new_form)) 155 goto opthelp; 156 form = new_form; 157 new_form = 1; 158 break; 159 case OPT_PARAM_ENC: 160 if (!opt_pair(opt_arg(), encodings, &asn1_flag)) 161 goto opthelp; 162 new_asn1_flag = 1; 163 break; 164 case OPT_GENKEY: 165 genkey = need_rand = 1; 166 break; 167 case OPT_RAND: 168 inrand = opt_arg(); 169 need_rand = 1; 170 break; 171 case OPT_ENGINE: 172 e = setup_engine(opt_arg(), 0); 173 break; 174 } 175 } 176 argc = opt_num_rest(); 177 if (argc != 0) 178 goto opthelp; 179 180 private = genkey ? 1 : 0; 181 182 in = bio_open_default(infile, 'r', informat); 183 if (in == NULL) 184 goto end; 185 out = bio_open_owner(outfile, outformat, private); 186 if (out == NULL) 187 goto end; 188 189 if (list_curves) { 190 EC_builtin_curve *curves = NULL; 191 size_t crv_len = EC_get_builtin_curves(NULL, 0); 192 size_t n; 193 194 curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves"); 195 if (!EC_get_builtin_curves(curves, crv_len)) { 196 OPENSSL_free(curves); 197 goto end; 198 } 199 200 for (n = 0; n < crv_len; n++) { 201 const char *comment; 202 const char *sname; 203 comment = curves[n].comment; 204 sname = OBJ_nid2sn(curves[n].nid); 205 if (comment == NULL) 206 comment = "CURVE DESCRIPTION NOT AVAILABLE"; 207 if (sname == NULL) 208 sname = ""; 209 210 BIO_printf(out, " %-10s: ", sname); 211 BIO_printf(out, "%s\n", comment); 212 } 213 214 OPENSSL_free(curves); 215 ret = 0; 216 goto end; 217 } 218 219 if (curve_name != NULL) { 220 int nid; 221 222 /* 223 * workaround for the SECG curve names secp192r1 and secp256r1 (which 224 * are the same as the curves prime192v1 and prime256v1 defined in 225 * X9.62) 226 */ 227 if (strcmp(curve_name, "secp192r1") == 0) { 228 BIO_printf(bio_err, "using curve name prime192v1 " 229 "instead of secp192r1\n"); 230 nid = NID_X9_62_prime192v1; 231 } else if (strcmp(curve_name, "secp256r1") == 0) { 232 BIO_printf(bio_err, "using curve name prime256v1 " 233 "instead of secp256r1\n"); 234 nid = NID_X9_62_prime256v1; 235 } else 236 nid = OBJ_sn2nid(curve_name); 237 238 if (nid == 0) 239 nid = EC_curve_nist2nid(curve_name); 240 241 if (nid == 0) { 242 BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name); 243 goto end; 244 } 245 246 group = EC_GROUP_new_by_curve_name(nid); 247 if (group == NULL) { 248 BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name); 249 goto end; 250 } 251 EC_GROUP_set_asn1_flag(group, asn1_flag); 252 EC_GROUP_set_point_conversion_form(group, form); 253 } else if (informat == FORMAT_ASN1) 254 group = d2i_ECPKParameters_bio(in, NULL); 255 else 256 group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL); 257 if (group == NULL) { 258 BIO_printf(bio_err, "unable to load elliptic curve parameters\n"); 259 ERR_print_errors(bio_err); 260 goto end; 261 } 262 263 if (new_form) 264 EC_GROUP_set_point_conversion_form(group, form); 265 266 if (new_asn1_flag) 267 EC_GROUP_set_asn1_flag(group, asn1_flag); 268 269 if (no_seed) { 270 EC_GROUP_set_seed(group, NULL, 0); 271 } 272 273 if (text) { 274 if (!ECPKParameters_print(out, group, 0)) 275 goto end; 276 } 277 278 if (check) { 279 BIO_printf(bio_err, "checking elliptic curve parameters: "); 280 if (!EC_GROUP_check(group, NULL)) { 281 BIO_printf(bio_err, "failed\n"); 282 ERR_print_errors(bio_err); 283 goto end; 284 } 285 BIO_printf(bio_err, "ok\n"); 286 287 } 288 289 if (C) { 290 size_t buf_len = 0, tmp_len = 0; 291 const EC_POINT *point; 292 int is_prime, len = 0; 293 const EC_METHOD *meth = EC_GROUP_method_of(group); 294 295 if ((ec_p = BN_new()) == NULL 296 || (ec_a = BN_new()) == NULL 297 || (ec_b = BN_new()) == NULL 298 || (ec_gen = BN_new()) == NULL 299 || (ec_order = BN_new()) == NULL 300 || (ec_cofactor = BN_new()) == NULL) { 301 perror("Can't allocate BN"); 302 goto end; 303 } 304 305 is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field); 306 if (!is_prime) { 307 BIO_printf(bio_err, "Can only handle X9.62 prime fields\n"); 308 goto end; 309 } 310 311 if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a, ec_b, NULL)) 312 goto end; 313 314 if ((point = EC_GROUP_get0_generator(group)) == NULL) 315 goto end; 316 if (!EC_POINT_point2bn(group, point, 317 EC_GROUP_get_point_conversion_form(group), 318 ec_gen, NULL)) 319 goto end; 320 if (!EC_GROUP_get_order(group, ec_order, NULL)) 321 goto end; 322 if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL)) 323 goto end; 324 325 if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor) 326 goto end; 327 328 len = BN_num_bits(ec_order); 329 330 if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len) 331 buf_len = tmp_len; 332 if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len) 333 buf_len = tmp_len; 334 if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len) 335 buf_len = tmp_len; 336 if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len) 337 buf_len = tmp_len; 338 if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len) 339 buf_len = tmp_len; 340 if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len) 341 buf_len = tmp_len; 342 343 buffer = app_malloc(buf_len, "BN buffer"); 344 345 BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len); 346 print_bignum_var(out, ec_p, "ec_p", len, buffer); 347 print_bignum_var(out, ec_a, "ec_a", len, buffer); 348 print_bignum_var(out, ec_b, "ec_b", len, buffer); 349 print_bignum_var(out, ec_gen, "ec_gen", len, buffer); 350 print_bignum_var(out, ec_order, "ec_order", len, buffer); 351 print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer); 352 BIO_printf(out, " int ok = 0;\n" 353 " EC_GROUP *group = NULL;\n" 354 " EC_POINT *point = NULL;\n" 355 " BIGNUM *tmp_1 = NULL;\n" 356 " BIGNUM *tmp_2 = NULL;\n" 357 " BIGNUM *tmp_3 = NULL;\n" 358 "\n"); 359 360 BIO_printf(out, " if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof (ec_p_%d), NULL)) == NULL)\n" 361 " goto err;\n", len, len); 362 BIO_printf(out, " if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof (ec_a_%d), NULL)) == NULL)\n" 363 " goto err;\n", len, len); 364 BIO_printf(out, " if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof (ec_b_%d), NULL)) == NULL)\n" 365 " goto err;\n", len, len); 366 BIO_printf(out, " if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n" 367 " goto err;\n" 368 "\n"); 369 BIO_printf(out, " /* build generator */\n"); 370 BIO_printf(out, " if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof (ec_gen_%d), tmp_1)) == NULL)\n" 371 " goto err;\n", len, len); 372 BIO_printf(out, " point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n"); 373 BIO_printf(out, " if (point == NULL)\n" 374 " goto err;\n"); 375 BIO_printf(out, " if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof (ec_order_%d), tmp_2)) == NULL)\n" 376 " goto err;\n", len, len); 377 BIO_printf(out, " if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof (ec_cofactor_%d), tmp_3)) == NULL)\n" 378 " goto err;\n", len, len); 379 BIO_printf(out, " if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n" 380 " goto err;\n" 381 "ok = 1;" 382 "\n"); 383 BIO_printf(out, "err:\n" 384 " BN_free(tmp_1);\n" 385 " BN_free(tmp_2);\n" 386 " BN_free(tmp_3);\n" 387 " EC_POINT_free(point);\n" 388 " if (!ok) {\n" 389 " EC_GROUP_free(group);\n" 390 " return NULL;\n" 391 " }\n" 392 " return (group);\n" 393 "}\n"); 394 } 395 396 if (!noout) { 397 if (outformat == FORMAT_ASN1) 398 i = i2d_ECPKParameters_bio(out, group); 399 else 400 i = PEM_write_bio_ECPKParameters(out, group); 401 if (!i) { 402 BIO_printf(bio_err, "unable to write elliptic " 403 "curve parameters\n"); 404 ERR_print_errors(bio_err); 405 goto end; 406 } 407 } 408 409 if (need_rand) { 410 app_RAND_load_file(NULL, (inrand != NULL)); 411 if (inrand != NULL) 412 BIO_printf(bio_err, "%ld semi-random bytes loaded\n", 413 app_RAND_load_files(inrand)); 414 } 415 416 if (genkey) { 417 EC_KEY *eckey = EC_KEY_new(); 418 419 if (eckey == NULL) 420 goto end; 421 422 assert(need_rand); 423 424 if (EC_KEY_set_group(eckey, group) == 0) { 425 BIO_printf(bio_err, "unable to set group when generating key\n"); 426 EC_KEY_free(eckey); 427 ERR_print_errors(bio_err); 428 goto end; 429 } 430 431 if (!EC_KEY_generate_key(eckey)) { 432 BIO_printf(bio_err, "unable to generate key\n"); 433 EC_KEY_free(eckey); 434 ERR_print_errors(bio_err); 435 goto end; 436 } 437 assert(private); 438 if (outformat == FORMAT_ASN1) 439 i = i2d_ECPrivateKey_bio(out, eckey); 440 else 441 i = PEM_write_bio_ECPrivateKey(out, eckey, NULL, 442 NULL, 0, NULL, NULL); 443 EC_KEY_free(eckey); 444 } 445 446 if (need_rand) 447 app_RAND_write_file(NULL); 448 449 ret = 0; 450 end: 451 BN_free(ec_p); 452 BN_free(ec_a); 453 BN_free(ec_b); 454 BN_free(ec_gen); 455 BN_free(ec_order); 456 BN_free(ec_cofactor); 457 OPENSSL_free(buffer); 458 EC_GROUP_free(group); 459 release_engine(e); 460 BIO_free(in); 461 BIO_free_all(out); 462 return (ret); 463} 464 465#endif 466